? ??????? ???????? ????? ??? ????? ?????? ???????, ??? ??????? ??? ???? ?? ????? ??????? ?? ???????? ??????? ?? ??????????:These early tractors were cumbersome, and unwell-suited to enter a discipline of planted row crops for weed Management. The "conventional" tractor definition is no longer in present-day use. On the other hand, tractors with fix